@quid (or any other mod): The tags chaos-theory and chaotic-systems are another issue which has been around for quite a long time. (It's about synonymizing and/or merging - so involvement of a moderator might be necessary.)

The list of proposals on the 2016 thread that are still open:
Proposal to rename the "adjoint" tag
Proposal to join the "chaos theory" and "chaotic systems" tags
Proposal to change the name of the "divisors" tag
Proposal to make the "compactification" tag a synonym of the "compactness" tag
Pr...

Please merge chaotic-systems and chaos-theory. I am active in these tags and the respective field and I fail to see a meaningful difference between them, let alone a need for a distinction.
This already got 10 upvotes last year.

I propose creating relation-composition tag and making it a synonym of function-composition. I think that if composition of functions is important enough to have its own tag, then so is composition of relations. But it would probably be better to have both topics under the same tag.
We definitel...

In mathematics, the Lerch zeta function, sometimes called the Hurwitz–Lerch zeta-function, is a special function that generalizes the Hurwitz zeta function and the polylogarithm. It is named after the Czech mathematician Mathias Lerch [1].
== Definition ==
The Lerch zeta function is given by
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@MartinSleziak merged with syn. Chaos theory master (among aothers, as it had a wiki)

@MartinSleziak seems good to me. // I can understand where the voter to close is coming from but it seems strange in the specific case. If an OP asks like this and then becomes obnoxious about some answers it's a different situation.

Sorry for the many pings. But the back-linking might be helpful for later readers.

@quid From the reply I guess you find the suggestion to have common tag for those at least somewhat reasonable. I am fine with whichever name. (It seems a bit long, but maybe it's clearer than having relations just as a synonym an mentioned in the tag-wiki...?)

We have some similar tags.

I guess we can marked some issues in the past thread as resolved. (Namely both 2016 and 2017 entry for chaos theory.)

I'll wait to see what happens with relation composition, so that we do not bumpt them twice in a relatively short time period.

@MartinSleziak I am not a fan of synonyms in general, so I try to avoid them. Merge done, function-and-relation-composition. I thought maybe to start with function is better. I did not yet update the tagwiki.